Switch Mockito.Matchers to ArgumentMatchers

Author: Capstan

src/test/java/com/github/fge/jackson/jsonpointer/TreePointerTest.java

@@ -28,7 +28,7 @@
 
 import java.util.List;
 
-import static org.mockito.Matchers.any;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.*;
 import static org.testng.Assert.*;